![]() Type MI cable shall be installed and supported in a manner to avoid tensile stress at the termination fittings. Type MI cable terminated with fittings listed for the location.An equipment grounding conductor shall be included to provide for electrical continuity of the raceway system and for grounding of non-current-carrying metal parts. Threaded rigid metal conduit or threaded steel intermediate metal conduit shall be used for the last 600 mm (24 in.) of the underground run to emergence or to the point of connection to the aboveground raceway. The concrete encasement shall be permitted to be omitted where subject to the provisions of 514.8, Exception No. If the disconnecting device(s) is located outside the building or enclosed space, it shall be suitable for the location in which it is installed.Įxception: Type PVC conduit, Type RTRC conduit, and Type HDPE conduit shall be permitted where encased in a concrete envelope a minimum of 50 mm (2 in.) thick and provided with not less than 600 mm (24 in.) of cover measured from the top of the conduit to grade. The power disconnecting device(s) shall be suitable for Class I, Division 1 if located inside the building or enclosed space.Sensing a gas concentration of not more than 40 percent of the lower flammable limit or a gas detector system malfunction shall both activate an alarm (audible or visual, or both, as most appropriate for the area) and initiate automatic disconnection of power from all electrical devices in the area that are not suitable for Class I, Division 2.An alarm (audible or visual, or both) shall be sounded at not more than 20 percent of the lower flammable limit.That is adjacent to a Class I, Division 1 location, and to which ignitible concentrations of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors above their flash points might occasionally be communicated unless such communication is prevented by adequate positive-pressure ventilation from a source of clean air and effective safeguards against ventilation failure are provided.Īny building or enclosed space that does not contain a source of flammable gas or vapors that is located in, or with an opening into, a Class I, Division 2 hazardous (classified) location that is provided with a combustible gas detection system shall be permitted to utilize electrical equipment, installation methods, and wiring practices suitable for unclassified installations under all of the following conditions:.In which ignitible concentrations of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are normally prevented by positive mechanical ventilation and which might become hazardous through failure or abnormal operation of the ventilating equipment, or.In which volatile flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are handled, processed, or used, but in which the liquids, vapors, or gases will normally be confined within closed containers or closed systems from which they can escape only in case of accidental rupture or breakdown of such containers or systems or in case of abnormal operation of equipment, or.All other locations where ignitible concentrations of flammable vapors or gases are likely to occur in the course of normal operationsĪ Class I, Division 2 location is a location:.The interiors of refrigerators and freezers in which volatile flammable materials are stored in open, lightly stoppered, or easily ruptured containers.Inadequately ventilated pump rooms for flammable gas or for volatile flammable liquids.Gas generator rooms and other portions of gas manufacturing plants where flammable gas may escape.Portions of cleaning and dyeing plants where flammable liquids are used.Locations containing fat- and oil-extraction equipment using volatile flammable solvents.Drying rooms or compartments for the evaporation of flammable solvents.Locations containing open tanks or vats of volatile flammable liquids. ![]() Interiors of spray booths and areas in the vicinity of spraying and painting operations where volatile flammable solvents are used.Where volatile flammable liquids or liquefied flammable gases are transferred from one container to another.1: This classification usually includes the following locations:
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